gnuplot: 3D plot of a matrix of data

Question

How can I plot (a 3D plot) a matrix in Gnuplot having such data structure, using the first row and column as a x and y ticks (the first number of the first row is the number

Answer 1

Exactly this data format can be read in with matrix nonuniform:

set view 50,20
set ticslevel 0
splot 'data.txt' matrix nonuniform with lines t ''

This generates the correct tics, like specified in the data file: